The Brazilian has regularly attracted the ire of Gunners fans during his time at the club, and never more so than when he asked for former team-mate Robin van Persie's shirt at half-time as the north London side slipped to defeat against Manchester United earlier this season.
But, after the 29-year-old replaced the injured Kieran Gibbs during Arsenal's thrilling 2-2 draw with Liverpool on Wednesday, Santos has promised his performances will improve.
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First-choice left-back Gibbs' injury is set to keep him out for three weeks, and Arsene Wenger has admitted he may need to sign a replacement.
"Gibbs has a thigh strain and that rules him out for the next three weeks – it is a big blow for us,” Wenger told reporters.
"I’ll see what I can do. Gibbs was a big player for us going forward and in the game we want to play. I cannot promise you any transfers. We work on it. We want an official extension of the window for one week."